Documentation: "it's" is used incorrectly several times

[trent-s]

Pull Request

Issue Number: 552

Summary

There are three places in the documentation where "it's" is used incorrectly, and should be replaced with "its".

Changes

File: README.md
Original: The Carbon Aware SDK at it's core sits firmly in the Tooling pillar,
Proposed: The Carbon Aware SDK at its core sits firmly in the Tooling pillar,

File: casdk-docs/docs/architecture/data-sources.md
Original: within it's implementation.
Proposed: within its implementation.

File: casdk-docs/docs/architecture/data-sources.md
Original: under it's purview
Proposed: under its purview

Checklist

• Local Tests Passing?
• CICD and Pipeline Tests Passing?
• Added any new Tests?
• Documentation Updates Made?
• Are there any API Changes? If yes, please describe below.
• This is not a breaking change. If it is, please describe it below.

Are there API Changes?

No API changes.

Is this a breaking change?

No. This is just a minor documentation change.

Anything else?

Thank you for your ongoing work and consideration of this PR.

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This PR Closes #552

[danuw]

LGTM